package com.sky.Aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * * 自定义切面类，统一为公共字段赋值
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    /**
     * * 通知 自动填充公共字段
     * * @param joinPoint
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("公共字段填充");
        //获得方法签名对象
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        // 获得方法上的注解
        AutoFill annotation = methodSignature.getMethod().getAnnotation(AutoFill.class);
        // 获得注解中的操作类型
        OperationType value = annotation.value();
        // 获取当前目标方法的参数
        Object[] args = joinPoint.getArgs();
        // 实体对象
        Object entity = args[0];
        // 准备赋值的数据
        LocalDateTime time = LocalDateTime.now();
        Long empId = BaseContext.getCurrentId();
        //将数据赋值给对象
        if (value == OperationType.INSERT) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setCreateTime.invoke(entity, time);
                setUpdateTime.invoke(entity, time);
                setUpdateUser.invoke(entity, empId);
                setCreateUser.invoke(entity, empId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        if (value == OperationType.UPDATE) {
            try {
                //获得set方法对象，*----Method
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, Long.class);
                //通过反射调用目标对象
                setUpdateTime.invoke(entity, time);
                setUpdateUser.invoke(entity, empId);

            } catch (Exception e) {
                log.error("公共字段填充失败：{}",e.getMessage());
            }
        }


    }
}
